ProMag WAL-A5 Walther P99 Magazine 20RD 40S&W Blued Steel - 40 S&W Caliber, Aftermarket Origin
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An extended 20-rd magazine for the Walther P99 / SW99 series of pistols in .40S&W. Constructed from heat-treated blued-steel, with a follower, lock-plate, and base-plate molded from a proprietary DuPont® Zytel™ based black polymer; and using a spring wound from Chrome-silicon wire and heat-treated for strength and reliability.